Another thing that I noticed is that when that happens or is about to happen (the spark issue) the tach will go crazy, showing 3k revs when Im pretty sure I'm going 1.5k.. but dont know if related...

My final thought was that my CDI is bad... what do u say?

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That mostly reflects a CDI issue, and since you are getting the 'no spark'...it's almost certainly the CDI..

The issue described early in the thread, showing the 'tach jumping'...
it's NOT the tach jumping when you turn the key from 'off' to 'on'....it's when you have it turned to 'on', and you hit the start button...

while the engine is turning over, if you have a good CDI, you will see the tach needle pulsing while the engine trys to start.
if the engine is turning over, but the tach needle remains motionless...the CDI is BAD...

Simply turning the keyswitch from 'off' to 'on' will make the tach jump(usually), even if the CDI is bad..

The CDI test isn't simply turning the keyswitch, it is more 'monitoring the tach' while trying to start the engine..

That mostly reflects a CDI issue, and since you are getting the 'no spark'...it's almost certainly the CDI..

The issue described early in the thread, showing the 'tach jumping'...
it's NOT the tach jumping when you turn the key from 'off' to 'on'....it's when you have it turned to 'on', and you hit the start button...

while the engine is turning over, if you have a good CDI, you will see the tach needle pulsing while the engine trys to start.
if the engine is turning over, but the tach needle remains motionless...the CDI is BAD...

Simply turning the keyswitch from 'off' to 'on' will make the tach jump(usually), even if the CDI is bad..

The CDI test isn't simply turning the keyswitch, it is more 'monitoring the tach' while trying to start the engine..

in my experience, the Fan only runs during 90F days, sitting in traffic....95% of the time, simply riding keeps the engine cool enough that the fan DOES NOT RUN.

IF the fan running causes the engine to stall....(check wiring for a cross, or grounded wires, something crossed from fan control to engine ground?)

change the thermoswitch for the fan control....

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Thanks for your concern... This is exactly what happened:

After having the whole engine rebuilt; I noticed that the fan was kicking in; and even though I WAS sitting in traffic, it was a surprise to me since I saw it in action only once since i bought the bike. Moreover, it kicked in like 2 or 3 times in a 10 mile city ride. Also, in that hot condition; the no-spark-condition began. Ever since, I would not be able to go over 5k revs for a long period; since when gaining heat, the no-spark bastard would kick in...

Ever since I changed the spark plug for the OEM one, the heat condition disappeared completely, and the fan is back to sleep. I can feel it in my legs too .. (that happened 2 days ago..). Apparently, the OEM plug has a higher resistance so it dissipates the heat more efficiently. Still, the no-spark thing remains.

I´ve just bought a new Ignition Coil, and I borrowed a working CDI from my mechanic, so as soon as I get off from work I´ll see what happens...

PD: How that small-bike-spark-plug ended up in my bike will always be a mistery..:huh

many folks around here dont know that the original NX OEM spark plug is plenty different from the standard issue NGK catalog plug.
The original plug is semi-threaded, with a tight fit on the aluminum head and the electrodes look much different too.

After replacing the CDI, ignition coil, spark-plug, and some faith, it finally seems to be working fine. Got home last night from work, installed all that and voilá!

When for a 30mile ride and nothing but perfection occurred, I love my bike again, so now I´m into making it look pretty again.

I must say I almost went suicidal last night.. I was like in the middle of nowhere. when suddenly the engine started to fail.. I said Sh*t, not again!!

I pulled over, long-face mode, and I just let my mind sink under useless thoughts... Tried to start the engine, unsuccessfully. Don´t ask me why, I turned the fuel knob to reserve, hit the ignition and Brrroooooom!!!! Back to life!

I have a spare engine, seat, CDi and a few other parts that will be listed if it sells.

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I may be interested in the seat - depending on color and condition. The seat on the NX I just purchased is more slippery than a banana peel, so I am trying to figure out the best alternative. Let me know if you decide to sell. Thanks - JD

We saw this bike chained to a tree in the infield of Mid Ohio Raceway while attending the Super Bike Races.

A week later we purchased it for the daughters to learn to ride. On the ride home I low sided and rag dolled it into the woods at 70 MPH. It was decided that we would get an NX125 for the children.

Being impressed with the performance of the stock machine, I set out to create a back roads bike to save wear and tear on the larger road bikes. Wheel, Tire, and Suspension upgrades would be required for the remote roads traveled.

Most of the mods were taken from the inmates of ADV Rider. Thanks To All

This is the bike that I needed / wanted and was built to meet my requirements. It was a work in progress for several years and now my favorite bike that I have owned over the last 32 years of adult riding.

A 21" front wheel was laced to an NX250 Front Hub with Buchanan KHON906SH Spoke Set

not trying to sell that wheel,
want to find out if someone is interested in the whole set-up
the 21" front end will raise the bike quite some,
even if you lower the tripples a bit,
the 17" rear will help getting everything back in balance

Work sent me to the desert to tune on a race car. So I took the nx250 and the mt250. Two of my favorite bikes of all time. It would be impossible to choose the best bike, but my girlfriend will say the elsinore 250.